Re: IPv6 beta support for Android phones

[Tom Hill <tom () ninjabadger net>]

Hi Cameron,

On Sun, 2011-11-06 at 21:31 -0800, Cameron Byrne wrote:
> There are a variety of reasons.  Most prominent is that if the issue
> is lack of IPv4 addresses (public and private), dual-stack does not
> solve this problem, each device still gets an IPv4 address.  Another
> major issue is that in GSM/UMTS (3GPP pre-release 9), having
> dual-stack means having 2 attachments to the network,  one for v4 and
> one for v6.  Most mobile providers pay for most of their network kit
> in terms of these attachments known as PDP.  Consequently, dual-stack
> doubles the of the packet-core network.  If we take the licensing and
> contractual parts out of the equations, double the attachments means
> double the signalling and mobility events ... resulting in double the
> CPU / Memory / blah ...

That'll probably explain it... Thanks. :)

> LTE does not have the dual attachment problem since there is the
> concept of having v4 and v6 in one attachment, but it does not change
> the fact that there are not enough IPv4 addresses to go around,
> especially from a strategic planning perspective (let's design this
> once for 5 to 10+ year life ...)

If only the UK was as far ahead on LTE as the US!

Tom